The generic name of Cardioplegia is nifedipine tablets, a calcium channel blocker. It is a calcium channel blocker. It is mainly used for angina pectoris and hypertension. The main ingredient of nifedipine tablets is nifedipine, nifedipine is a dihydropyridine calcium antagonist, which can selectively inhibit the transmembrane transport of calcium ions into cardiomyocytes and smooth muscle cells and inhibit the release of calcium ions from the cells without altering the concentration of plasma calcium ions, and therefore it can be used for the treatment of angina pectoris; hypertension (alone or in combination with other antihypertensive drugs). Patients with hypotension may experience severe hypotension with nifedipine, and blood pressure needs to be monitored during use of the drug, especially when combined with other antihypertensive drugs. Very few patients, especially those with severe coronary stenosis, experience increased heart rate from reflex sympathetic excitation and increased incidence of angina pectoris or myocardial infarction after lowering blood pressure while taking nifedipine or during dosing. Mild to moderate peripheral edema occurs in 10% of patients and is associated with arterial dilatation. Edema tends to initially occur at the ends of the lower extremities and can be treated with diuretics. In patients with congestive heart failure, it is important to distinguish whether edema is due to further deterioration of left ventricular function. Heart failure may occur in a small number of patients receiving beta-blockers after initiation of nifedipine, with a greater risk in patients with severe aortic stenosis. Nifedipine tablets are prescription drugs and should be used under the supervision of a physician if needed to minimize the risk of medication.